The Litvinko killing

This story gets stranger and larger by the day. Latest news from the BBC indicates that Finnish airline Finnair is now involved:

On Saturday the Russian transport ministry's press service said traces of radiation have been found on a Finnish plane in Moscow that had flown from Berlin via Helsinki.

I've no idea how a plane not even in England and in fact flying the opposite direction could've come into contact with the substance, but that's what it looks like happened. Sad, since last I new airports had screening machines that picked up on radioactive material people were trying to smuggle onto planes. Obviously not a sound investment.